Indonesia remained China’s second-biggest nickel ore supplier in 2020, Chinese customs data showed on Wednesday, despite the Southeast Asian country’s ban on exports of the material.   Arrivals of Indonesian nickel ore into China totalled 3.4 million tonnes last year, the General Administration of Customs reported. That was down 85.8% from 2019 but still second only to the Philippines at 31.98 million tonnes, and ahead of New Caled...